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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Jørgensen P. M. (98-03-20); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 16. Erioderma. Genus of unknown placement (incertae sedis); Peltigerineae; Lecanorales.

Taxonomic Literature: Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [167-169], Wellington (1985); Galloway D.J. & Jørgensen P.M., Lichenologist 7: 139-142 (1975); Keuck G., Biblioth. Lichenol. 6: 1-175 (1977), Poelt J. & Vezda A., Biblioth. Lichenol. 9: 1-258 [107] (1977).

Biogeography: Checklist records: Sweden and Norway, New Zealand, United States and Canada (continental), Guianas, Thailand, New Guinea, and Bolivia.

Lichen Photobionts: Primary photobiont present; cyanobacterial. Primary photobiont taxonomy: Scytonema (A. Beck 22-05-97); Scytonemataceae; Nostocales, Cyanobacteria, Prokaryota. Secondary photobiont absent.

Thallus: Foliose, not subdivided parts, granular, lobed. Thallus Outline: Soon disappearing. Upper Surface: Brown, grey, brownish yellow, or olive; special structures present:; not pseudocyphellate; eciliate; hairy; not isidate; sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by holdfasts; special structures present:; not pseudocyphellate; not cyphellate; rhizinate; without thalloconidia thalloconidia; not cavernulate; tomentose.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, forming all across the thallus surface or directly at the thallus margin, soon sessile to substipitate. Margin: Prominent; external filaments absent. Exciple: Black. Periphyses: Absent. Epithecium: Apical cells brown. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Black.

Asci: Tholus thickened, amyloid, with amyloid cap; dehiscence lecanoralean; exoascus euamyloid.

Ascospores: c. 8 per ascus, ellipsoid, 1 µm long, 1 µm wide, obtuse; septa absent; wall thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented or ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; immersed or stipitate.

Secondary Metabolites: Not detected or present, of the following substance class(es): ß-orcinol depsidones and (anthra-)quinones.

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